Metal working press



3 May 23, 1933. v CRANE 1,910,523

METAL WORKING PRESS Filed Oct. 10, 1931 5 Sheets-Sheet 1 y 1933. E. v.CRANE 1,910,523

METAL WORKING PRES S y 1933- E. v: CRANE 1,910,523

METAL WORKING PRES 5 Filed Oct. 10, 1951 5 Sheets-Sheet s May 23, 1933.E, v. CRANE 1,910,523

' METAL WORKING PRESS Filed Oct. 10, 1951 5 Sheets-Sheet 4 May 23, 1933.E v CRANE 1,910,523

METAL WORKING PRESS Filed Oct. 10, 1931 5 Sheets$heet 5 Patented May 23,1933 UNETED t'tTATES PATENT ()FFICE EDWARD V. CRANE, OF BROOKLYN, NEWYORK, ASSIGNOR TO MARQUETTE TOOL 8t; MFG. COMPANY, OF CHICAGO, ILLINOIS,A CORPORATION OF ILLINOIS METAL WORKING PRESS Application filed October10, 1931.

This invention relates in general to metal working presses, but morespecifically though not necessarily limited, to the use of drawingshlfet metal shells, vessels, receptacles and the li e.

It is well known that in presses of this character the limit of thedrawing action or depth of the draw is determined by the actual travelof the slide of the press.

It is one of the objects of the present invention to provide in a pressof this charac ter means whereby shells, vessels, receptacles and thelike may be drawn deeper than onehalf of the stroke of the press, whichis now the drawing limit of an ordinary press.

A further object is to provide. in a single action press improved meansfor increasing the depth of the draw beyond the actual travel of theslide of the press, and which means is arranged above the bed of thepress, and at the same time provide means whereby the pressure requiredto maintain the blank against wrinkling will always be in properproportion or ratio to the drawing pressure required by the materialbeing acted upon.

To the attainment of these ends and the accomplishment of other new anduseful ob jects as will appear, the invention consists in the featuresof novelty in substantially the construction, combination andarrangement of the several parts hereinafter more fully described andclaimed and shown in the accompanying drawings illustrating thisinvention and in which Figure 1 is a view partly in elevation and partlyin vertical section, parts being omitted, of a press of this characterconstructed in accordance with the principles of this invention, andshowing the position the parts will assume. when the slide or ram is atthe limit of its upward movement.

Figure 2 is a view similar to Figure 1, on an enlarged scale, showingthe position the parts will assume during a portion, of the stroke ofthe press.

Figure 3 is a view similar to Figure 2 showing the position the partswill assume at the limit of the downward movement of the slide of thepress.

Serial No. 568,135.

Extending above the bed of the press are uprights 14 and journaled insuitable bearings and extending across the space between the uprights isa shaft 15 to which is connected a crank 16. Movable between the uprights 14 and in a manner to be guided thereby is a reciprocable memberor slide 17 which is connected tothe crank 16 by means of a suitablelink or coupling 18 through the medium of a pivot pin 19. The shaft isrotated in any suitable manner (not shown) so as to cause areciprocation of the slide 17.

Carried by the slide 17 are fulcrums 20, any number of which may beprovided, but four are usually employed, one adjacent each corner of theslide. Pivotally mounted intermediate its ends and to each of thefulcrums 20 as at 21, is a lever 22, and adjustably secured to the outerend of each of the levers 22 by means of adjustable fastening devices 23is a bearing 24, to which one end of a link 25 is pivotally connected asat 26, the bearing 24 being adjustable toward and away from the pivot 21to vary or adjust the throw or rocking movement of the lever 22 as maybe desired. The other end of each of the links 25 is pivotally connectedas at 27 to a slide 28, which moves in suitable guides between theuprights 14 and secured to the slide 28 is a work holder 29, which, whenthe slide 28 is at the limit of its lowermost movement, will c0-0peratewith the die 11 to clamp the work 30 therebetween and serve to hold thework with the desired pressure to permit the formation of the work andprevent wrinkling of the same.

The slide 28 is supported by the slide 17 through the medium of thefulcrums 20', pivot 21, levers 22 and links 25, so that when the slide17 is reciprocated toward and away from the work during predeterminedportions of the cycle of operation of the press the slide 28 will becorrespondingly moved. However, the slide 28 is preferably spaced ashort distance below the slide 17, and resiliently yielding members 31preferably in the form of coiled springs, any number of which may beprovided, are disposed between the slides 17 and 28, and tend normallyto separate them, for a purpose and in a manner to be set forth.

The slide 28 is hollow and reciprocable therein is a member 32 to whichone end of links 33 are pivotally connected as at 34 and the other endof the links are pivotally connected as at 35 to the respective levers22 on the sides of the pivots 21 opposite to the side on which thebearing member 2 1 and the ends of the link 25 are connected.

With this construction it will be manifest that assuming the parts to bein the position shown in Figure 1 when the slides 17 and 28 are loweredthey will move in unison and the levers 22 and links 25 and 33 will movetherewith, the resilient members 31 tending to separate the slides 28and 17 to maintain the parts in the relative positions shown inFigure 1. When, however, the slide 28 has moved to the position shown inFigure 2, that is so that the work holder 29 will 00- operate with thedie 11 to clamp the work 30, the movement of the slide 28 will bearrested. This occurs before the limit of the downward throw of thepress is reached. The slide 28 being thus arrested in its downwardmovement, the crank 16 will continue to rotate and will further move theslide 17 in the same direction, with the result that the resilientmembers 31 will be compressed so as to allow the slide 17 to move towardthe slide 28. This relative movement of the slide 17 with respect to theslide 28 will lower the fulcrums 20 and consequently the levers 22, andas the slide 28 will then be held stationary such lowering movement ofthe slide 17 will cause the levers to rock about the pivots 21 by reasonof the fact that the point of pivotal support or fulcrum will at thistime be shifted from the pivots 21 to the pivots 26. This rockingmovement of the levers 22 will move the member 32 which constitutes theram downwardly with respect to the slide 28, causing a punch 36 which iscarried by the member or ram 32, to force the material 30 into the die11, as shown in Figure 3 of the drawings, thereby shaping the work.

At the time that the slide 17 starts to ascend, the slide 28 will bemomentarily restrained from directly following the slide 17 by reason ofthe expansion of the resilient members 31, such relative movement beingsufiicient to permit the punch or die 36 to be partially stripped of thefinished work.

As the slide 17 continues to ascend and as the resilient members 31expand to cause a relative movement between the slides 17 and 28 thefulcrums 20 will be raised with respect to the slides 28 and the pivotof the levers 22 will be again shifted from the pivot 26 back to thepivot 21, causing the levers 22 to rock in the opposite direction aboutthe pivots 21 and thereby move the member or ram 32 from the positionshown in Figure 2, back to the position shown in Figure 1, with respectto the work holder 29 and the slide 28.

It will therefore be manifest that with this improved construction itwill be possible to provide in a single acting press a means to increasethe stroke of the press beyond that of the normal crank throw, resulting in an increased depth of draw upon the work.

Obviously the depth of the draw may be controlled by adjusting thebearing members 24 towards or away from the pivot 21 to vary or alterthe throw of the levers 22.

' As a means for maintaining the slide 17 and the ram or member 32 inalinement and to prevent lateral displacement one withrespect to theother, there may be provided a projection 37 carried by one of theslides, preferably the slide 17, which is adapted'to enter a recess oropening 38 in the proximate face of the member or ram 32.

If desired, the member or ram 32 may be provided with projecting ribs 39adapted to move in guideways 40 in the slide 28.

It will also be manifest that with this invention the use of cumbersometoggles used in connection with toggle presses may be dispensed with andthe construction of the press greatly simplified, with the result thatthe same results and purposes which have here tofore been produced upona double action press may be accomplished in a single action press. Thepressure necessary to main tain the blank from wrinkling is derivedthough a system of levers and links and the correct pressure can bedetermined through this arrangement and will always be in proportion tothe drawing pressure required by the material.

This is accomplished because when the work holder 29 carried by theslide 28 abuts the work 30, the movement of the slide will be arrested.During this lowering of the slide 28 the slide 17 and fulcrums 20 withlevers 22 are being pulled down or bodily lowered by the pivots 21, butwhen the slide 28 is arrested the member 32 continues to move downwardlycausing a shifting of the fulcrum of the lever 22 from the pivot 21 tothe pivot 26.

Furthermore, all of the parts of this mechanism are arranged above thebed of the ress.

While the preferred form of the invention has been herein shown anddescribed, it is to be understood that various changes may be made inthe details of construction and in the combination and arrangement ofthe several parts, within the scope of the claims, without departingfrom the spirit of this invention.

iVhat is claimed as new is 1. In a metal working press, a reciprocablemember, a crank operating to impart a fixed throw to said member, a diemovable with and with respect to said member, means operatingautomatically at a predetermined time in the cycle of operation of thepress for moving the said die with respect to the said member, beyondthe normal crank throw of said member, the said means embodying a workholder movable with and with respect to said member, and lever and linkconnections between said work holder, member and said die.

2. In a metal working press, a reciprocable member, a crank operating toimpart a fixed throw to said member, a die movable with and with respectto said member, means operating automatically at a predetermined time inthe cycle of operation of the press for moving the said die with respectto the said member, beyond the normal crank throw of said member, thesaid means embodying a work holder movable with and with respect to thesaid member, resiliently yielding means disposed between said workholder and member and tending normally to separate them, and lever andlink connections between said work holder, said member and said die.

3. In a metal working press, a reciprocable member, a crank operating toimpart a fixed throw to said member, a die movable with and with respectto said member, means operating automatically at a predetermined time inthe cycle of operation of the press for moving the said die with respectto the said member, beyond the normal crank throw of said member, thesaid means embodying a work holder movable with and with respect to thesaid member, resiliently yielding means disposed between said workholder and mem her and tending normally to separate them, and lever andlink connections between said work holder, said member and said die,said work hold-er also operating at a predetermined time in the cycle ofoperation of the press as a stripper for the work from said die.

4. In a metal working press, a ram, a die carried therewith and movablewith respect thereto, said ram having a fixed throw, means embodyinglever and link connections between said ram and said die and renderedactive at a predetermined time in the cycle of operation of the ram formoving the die beyond the normal throw of the ram, and

means whereby the extent of the last said movement of the die may bevaried.

5. In a metal working press, a ram, a die movable therewith and withrespect thereto, a work holder also associated with the ram, a fixedelement with which the work holder co-operates, and means wherebycontact of said work holder with said element will move said die beyondthe limit of the stroke of the die with the ram and towards the saidelement, the said means embodying lever and link connections between theram and die.

6. In a metal working press, a slide, reciprocable with a set throw, asecond slide disposed therebelow, resiliently yielding means disposedbetween the slides and tending normally to separate them, a leverfulcrumed intermediate the ends upon the first said slide, a linkconnection between one end of the lever and the said second slide, amovable die, a link connection between the said movable die and theother end of the lever, and a fixed element against which said secondslide is adapted to abut at a predetermined time in the cycle ofreciprocation of the press, whereby the movement of the said secondslide will be arrested and the first said slide will continue itsmovement to rock said lever to move said die towards the said fixedelement.

7. In a metal working press, a slide, reciprocable with a set throw, asecond slide disposed therebelow, resiliently yielding means disposedbetween the slides and tending normally to separate them, a leverfulcrumed intermediate the ends upon the first said slide, a linkconnection between one end of the lever and the said second slide, amovable die, a link connection between the said movable die and theother end of the lever, a fixed element against which said second slideis adapted to abut at a predetermined time in the cycle of reciprocationof the press, whereby the movement of the said second slide will bearrested and the first said slide will continue its movement to rocksaid lever to move said die towards the said fixed element, and meanswhereby the extent of rocking movement of the lever may be varied.

8. In a metal working press, a fixed die, a work holder co-operatingwith said fixed die, a shaping member, means for actuating the saidmember to operate upon the work, and means whereby the pressure exertedby said shaping member upon the work to shape it, will automaticallycontrol the degree of pressure between the work holder and the work, thelast said means embodying a series of levers and link connectionsbetween the shaping member and the work holder.

9. In a metal working press, a slide reciprocable with a set throw, asecond slide spaced therefrom, resiliently yielding means disposedbetween the slides and tending normally to separate them, a leverfulcrumed intermediate it's en'ds upon one of the slides, a linkadjustably connected by one end to one end of the lever and connected byits other end to the other slide, a movable die, a link connectionbetween the said movable die and the other end of the lever, and a fixedelement against Which said second slide is adapted to abut at apredetermined time in the cycle of reciprocation of the press, wherebythe movement of the last said slide Will be arrested and the first saidslide Will continue its movement to rock said lever to move said die to-Ward the said fixed element.

In testimony whereof I have signed my name to this specification, onthis 25th day of September, A. D. 1931.

EDWVARD V. CRANE.

